Tribochemical study of tetrazole derivatives as lubricating oil additives

• Published in: Industrial lubrication and tribology Vol. 57; no. 2; pp. 64 - 68
• Main Authors: He, Zhongyi, Shao, Heyang, Rao, Wenqi, Ren, Tianhui, Liu, Weimin
• Format: Journal Article
• Language: English
• Published: Bradford Emerald Group Publishing Limited 01.04.2005; Emerald
• Subjects: Additives; Antiwear additives; Applied sciences; Energy; Exact sciences and technology; Experiments; Friction; Friction, wear, lubrication; Lubricating oils; Machine components; Mechanical engineering. Machine design; Organic compounds; Spectrum analysis; Tribology; Lubricating oils; Additives; Tribology; Organic compounds; Lubricating oil; Tribochemical reaction; X ray spectrometry; Antioxidant; Organic nitrogen compounds; Adsorption; Antiwear additive; Lubricant additive; Wear; Concentration effect; Four ball machine; Groove; Photoelectron spectrometry; Ball bearing steel; Loadbearing capacity; Protective coatings
• ISSN: 0036-8792; 1758-5775
• DOI: 10.1108/00368790510583366

Purpose - To study some tribochemical properties of tetrazole derivatives, n-hexadecanyl (1H-tetrazol-1-yl) acetate (HTA) and 1-phenyl-5-(octylthio)-tetrazole (PCT) as lubricating oil additives in hydrogenised oil, and estimate the action mechanism.Design methodology approach - The two tetrazole compounds were synthesized, and added them in hydrogenised oil with different concentrations. Their anti-wear properties were evaluated with a four-ball machine, the wear scar was analyzed with a X-ray photoelectron spectroscopy (XPS).Findings - The novel compounds possess good anti-wear, friction reduction properties and good load-carrying capacity. According to the XPS results, the novel compounds were migrated onto the surface of the steel balls and adsorbed on the surface. The two additive compounds, themselves, and their decomposers contributed to the corresponding tribological performances. With S element contained in the compound PCT, the influence on the load-carrying capacity of the base oil was enhanced. It may be due to the formation of S2− and SO42− compounds on the worn surface which could form a protective film.Research limitations implications - Their antioxidant, anticorrosion, anti-wear properties are not estimated.Practical implications - Two useful EP and AW lubricating oil additives were synthesized, and maybe it is the potential industrial applied lubricating oil additives.Originality value - This paper provided a study way of some N-containing heterocyclic compounds as lubricating oil additives.